<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    .clock {
      position: relative;
      width: 600px;
      height: 600px;
      margin: 30px auto;
      background: url(./images/clock.jpg) no-repeat center;
    }

    .clock .h {
      position: absolute;
      top: 32%;
      left: 50%;
      width: 20px;
      height: 118px;
      margin-left: -10px;
      background: url(./images/hour.png) no-repeat -5px -192px;
      transform-origin: calc(100% - 10px) 93%;
    }

    .clock .m {
      position: absolute;
      top: 20%;
      left: 50%;
      width: 12px;
      height: 185px;
      margin-left: -6px;
      background: url(./images/minute.png) no-repeat -9px -121px;
      transform-origin: calc(100% - 6px) 98%;
    }

    .clock .s {
      position: absolute;
      top: 20%;
      left: 50%;
      width: 24px;
      height: 251px;
      margin-left: -12px;
      background: url(./images/second.png) no-repeat -3px -117px;
      transform-origin: calc(100% - 12px) 73%;
    }
  </style>
</head>

<body>
  <div class="clock">
    <div class="h"></div>
    <div class="m"></div>
    <div class="s"></div>
  </div>
  <script>
    // 封装时钟效果，定时器定时调用的函数
    function getCurrentTime() {
      // 获取当前时间
      const currentTime = new Date()
      const hour = currentTime.getHours()
      const minute = currentTime.getMinutes()
      const second = currentTime.getSeconds()

      //时钟动画效果
      // 角度换算： 公式复制即可
      //   小时角度公式：小时 * 30 + 分钟 / 60 * 30 
      //   分钟角度公式：分钟* 6 + 秒 / 60 * 6
      //   秒角度公式： 当前秒数 * 6
      ss.style.transform = `rotate(${second * 6}deg)`
      mm.style.transform = `rotate(${minute * 6 + second / 60 * 6}deg)`
      hh.style.transform = `rotate(${hour * 30 + minute / 60 * 30}deg)`

    }

    // 获取时分秒针dom元素
    const ss = document.querySelector('.s')
    const mm = document.querySelector('.m')
    const hh = document.querySelector('.h')

    // 页面刷新时设置指针的初始位置
    getCurrentTime()

    // 每隔一秒获取一次时间 
    setInterval(getCurrentTime, 1000)
  </script>
</body>

</html>